The picture is one of the most important assets on your website. It should become your content strategy that is indispensable The lack of part. They can not only help you tell stories and communicate with your customers, but also not only words. But what if you do not use the correct image size? What if these images are optimized for mobile screens (the most popular access to the Internet now)? How to ensure that your picture is loaded at the right time?
We have some best practices that optimize images and measuring performance.
This article will show you how to solve all these annoying image problems so that they look great on any device and will not affect your performance.
Why does it provide optimized images to mobile devices
1. Images will affect the performance of your WordPress website
The image will occupy a large number of disk space and bandwidth, as shown below the example below Show,
, the image occupies 48.25%of my content size.
] Check the content of the content of the content -Source: pingdom
For the movement page, speed and size are important. In 2022, it is not enough to have mobile devices. movement speed on your brand website should be a priority. Each marketer needs a \”mobile speed budget\” because mobile devices are the most commonly used platforms: people use mobile phones to search, browse and shopping more times than ever. But as the brand continues to invest in high -quality images for their websites, they also take the risk of reducing the speed of the website. Although the image may make the website more visually attractive and attractive, they will slow down the loading time, resulting in a reduction in the number of transformations and missing the opportunity to create income.
Google conducted some studies and found that one second can affect up to 20% of conversion. If the loading time exceeds three seconds, one -half of the visitors will leave your mobile website. This may be a large amount of money directly to your competitors.
The impact of slow access to mobile website -Source: Think with Google
Mary Ellen Coe The speed of mobile websites is deemed to be growth momentum. Visitors will be more enthusiastic about participating and shopping on WordPress websites suitable for mobile devices.
More importantly, Let’s see the image performance How How to affect the overall performance score .为了衡量
移动
性能，Lighthouse 考虑了以下六个指标：
[ 123]
You may want to know which position of the \”image weight and loading time\” problem in these KPIs. This issue will be unclear. Instead, you can find the opportunity to improve the mobile performance -related opportunity in the LightHouse report, that is,:
Image of the appropriate size (implementation of response image)
Effectively encoding the image [ 123] Delayed off -screen image (implementation delay loading) The following format provides images, and uses webp
Tip
: By optimizing and compressed images, you will solve the suggestion of LightHouse and make six KPI closer to the green area. This will have a positive impact on your overall performance level.
2. The image on the mobile phone has a different effect on the image on the desktop
] Every day, more and more people use smartphones to access the Internet, which means that if your website is not optimized, you will miss millions (or even billions of) potential customers. Optimization will not only make you more advantageous than competitors that have not been done yet, but also have many benefits, such as to improve the user experience by making everything faster and easier to use -this will improve customer satisfaction. Essence Compared with desktop or laptop, the screen size of the mobile device is smaller, which means that the image needs to be reduced in proportion to the space provided by the screen. When the image size is not adjusted correctly, it will make it difficult for the content to read on the small screen, thereby reducing the user experience. The picture below perfectly illustrates the design preference of each device:
Optimize the image and text of mobile devices ] Left:
The text is difficult to read, and the small map in the upper left corner is not attractive.
Right:
The content is completely suitable for the screen. The proportion of the main image is also very good. We think I want to read more content and continue rolling.
In addition, have you heard of the new Google page experience update?
Google page experience update is the latest SEO ranking factor. It includes a set of KPIs to measure how users think of your webpage experience. guess what? It includes
mobile friendship ! The page experience you will provide determines your ranking on Google, which makes it another important reason for optimizing the content of mobile devices.
The importance of mobile friendship to SEO -Source: Search signal of page experience
[ 123] This is why
Your
website design is more important than ever before is also applicable to mobile devices.
Want to know if your website is fast on mobile devices? Want to know which images have the greatest impact on your performance? This brings us to the next part.
How to measure the impact of images on mobile devices You can use four popularity Performance tools to measure the impact of images on movement speed, that is:
Google PageSpeed \u200b\u200bInsights (PSI) gtmetrix
Google Search console For all these, just enter a URL to test the page load time, run analysis and find bottlenecks. Let us outline each of them. 1.The performance of WordPress website on mobile devices and desktop devices. These reports are based on LightHouse technology and recommend how to improve the performance of the page.
PSI helps measure the core network vitality. This is a set of Google believes Very important factors.
You will not see any indicators that explain the optimization of mobile images.
On the contrary, LightHouse will check your page based on the best practice of mobile performance and provide image optimization list:
] The image optimization list recommended by LightHouse -Source: PSI Do you want to know more about improving the LightHouse indicator? WP Rocket wrote a detailed guide on how to improve the Core Web Vitals.
2.gtmetrix
GTMETRIX is also a website performance analysis tool created by GT.NET. The mission of GTMETRIX is to analyze the performance of your website and provide you with a series of operating prompts to improve it.
The main KPI and PSI measured by gtmetrix measure Vitals and other LightHouse indicators. In addition, you can also notice the complete loading time and TTFB indicators.
GTMETRIX tells you how the page content is decomposed into pictures, videos, JS, CSS, etc.
Then, to determine which images need to be optimized, you can use the waterfall part. Select the \”Image\” tab to check which images need to be compressed or adjusted.
The waterfall map of the image Run a specific mobile test on GTMETRIX, you need PRO version. Only in this way can you access the mobile test through a real hardware solution. 3. PingDom PingDom can report whether the website is closed due to network division or any part of the world’s DNS server. It monitor the health status and performance of your website (level from A to F).
In addition to the overall performance level, the measured main KPI is page size, HTTP request and load time Essence
One of the interesting parts is \”the content of the content divided by the content type\”. From there, you can see the content of the most space on the page: images, code, etc.
The content of the content divided by the content type -Source: pingdom Note: Just Like GTMETRIX, you need the Pro version to test your website on mobile devices.
4. Google Search Console
Although it has nothing to do with its performance, Search Console’s mobile device friendly testing tool is a simple way to test whether the webpage on your website is suitable for mobile devices is suitable for mobile devices Essence
Source: Google Search Console
The test results include the following elements:
] The screenshot of the display effect of Google on the mobile device on this page may affect the list of the availability of any mobile device on your website on the mobile device, such as small fonts (difficult to be in the small font (difficult to be on the font Read on mobile devices) or use Flash (most mobile devices do not support).You will get \”yes\” or \”no\” response, and provide more resources and reports that can be used to solve problems.
is not suitable for mobile devices WebsiteSite suitable for mobile devices
Since you already have tools that identify any image -related issues on mobile devices, then you can share some technical techniques with your developers. Note: These image optimization technology will benefit your brand. You can retain high -quality images and eventually create a faster mobile experience for visitors.
How to optimize and load small images for mobile devices
This section will show you how to optimize images for mobile devices and improve performance. You need to understand all information about image optimization and how to use smaller images on mobile devices.
1. Adjust the size and provide images optimized for mobile devices to help your website lighter and faster the easiest way to help your website optimize the size and resolution of the image. The problem is that you may want to provide small images without affecting quality, right? In this case, you should apply two advanced strategies:
to adjust the size and compressed image for mobile devices
.
Let us start from adjusting the photo size.
When uploading the image to the page, you can specify the pixel number directly on WordPress. For example, you can set a new size, such as 400 × 300 instead of 1200 × 800.
How to reduce the picture size in the mobile phone?
Automatic method : Use plug -in using plugins like imagify to adjust the size of multiple images online. With imagify, all you need to do is install plug -ins and check some options, such as the maximum resolution to adjust the image to
To optimize your images in batches on mobile devices, just transfer to your ImagiFy instrument board:
Media → Batch optimization
, so you can optimize all the images of your website with one click to optimize all the images of your website Essence
Manual Method
: Editors such as using WordPress library or local Windows/Mac tools to adjust the picture size. If you have a lot of images, this may be very time -consuming.
Manually adjust the picture size -Source: WordPress library [
123]
How to create multiple design versions for mobile devices?
A good suggestion -if your network project has not started yet -it is to build your entire website directly for the mobile phone. It is more prone to friction on smaller screens, because you can place a lot of content on smaller screens: images, texts, videos, appeal words, and so on.
In fact, it is easier to design the design based on the mobile device and then apply it to the desktop version instead of in turn.
To have a mobile design, you should give priority to the important menu options so that all content is easy to click, including
image and gallery , highlight the main CTA and provide available filter functions functions Essence
Solution:
Use the WordPress page to build a different design for the desktop and mobile devices. Let’s see an example of using Elements. We can display different image size on the mobile device:
Response function -Source -Source : Elementor Website Builder
There is also a dedicated \”response\” tab, allowing you
The response tab and visible part of the mobile device -Source: Elementor Website Builder
]
How to find the size of the best image file suitable for mobile devices?
The best file size on mobile devices does not change. We just want the browser to load the correct images anywhere on the desktop or mobile device. There are two standards that need to be considered:
desktop (1280 PX) tablet computers (640 PX) and mobile device (320 PX) viewport size The image is relative to the viewport relative to the viewport relative to the viewport The sizeSome design tools (such as Sketch) follow the line frame and prefabricated template, which can be used for each device. Below, we chose the mobile phone portrait template, and we can see that the size of 320*1024 by defaults.
Design on mobile devices -Source: sketch template As a general rule, you can also follow the response design of ImageKit:
The ratio of the desktop to the mobile device -Source -Source : Imagekit 2. After the compression mobile image
, the compressed image is the second advanced technology you should follow when loading smaller images for mobile devices. Essence
Compressed images for mobile devices only means reducing its file size. This is achieved by minimizing the byte size of the image without losing any quality. Both are beautiful!
There are some fast and effective solutions here to compress your mobile image
.
Use WordPress plug -in : Optimole -Provide compression, delay loading and advanced cutsIMAGIFY -One One Key optimization and compressing your image. Imagify will reduce the size of the file but not affect the quality, as shown below:
The original image without imagify ] File size: 335 kb
Use Imagify Ultra mode compressed image
New file size:
45 Kb
saving percentage:
86.57%
]
2. Use Imagify
directly on the desktop: Just drag and drop the image to compress it.
3. For for it The selection of the mobile device to select effective image format
Selecting the appropriate file format will have a positive impact on reducing the image size on the mobile device. JPG does not always answer. Try to use the webp format. This modern format saves about 25% of storage space than JPEG or PNG files. Another advantage of the webp format is that the WordPress library now supports it(Even if you always convert the image to a webp).
If you want to know more information,
Please read our detailed guide to understand how to convert the image to a webp format.
Let’s see a practical example. The following three images have the same resolution: 600 x 600 pixels. However, let’s decompose the size according to each format:
JPG is 99.8KB
png is 217kb webp is 56.2KB
(123] ( This makes it the lightest file format without affecting the quality of the mobile device).
Comparing the format and size on the mobile device -source: images ] In short, Google lists the most effective format based on the image type you used on mobile devices:
[ 123] Google selects the correct format list -Source: Think with Google
Use a webp format solution on mobile images:
If you want to go directly from WordPress Convert the website image to webp, please use the Imagify plug -in.
For this, please go to
Settings → Imagination
and roll to the \”Optimized Webp format\” part:
[ 123]
Convert the image to webp -Source: Imagify
4. Implement delay loading It will have delay loading on your image, which will be loaded. Help your mobile page load faster. Why? Because delay loading delays the loading of large elements (such as images) on the mobile device. This will also solve the suggestion of \”postponing extra -screen images on your website\” from Google PageSpeed \u200b\u200bInsights.
实现延迟加载脚本的解决方案：
使用其中一个免费的WordPress 插件：[ 123] Delay loading of WP Rocket -You can even choose not to \”delay the additionThe image of \”contains\”. The plug -in displaying images and iframes on the page only when the visitors can see, thereby saving a lot of HTTP requests!
Automatic optimization
] 2. Use
Advanced plug -in that can improve the overall performance
:
WP Rocket cache plug -in, with CSS and JS optimization, of course, there are integrated delay loading functions:
Media tab -Source: wp rocket instrument board
5 . Use CDN
Image content delivery network (CDN) is an essential condition for optimizing mobile device image delivery. According to Web.DEV, switching to the image CDN can save 40-80% of the image file size! 123]
GTMETRIX explains the principle of CDN very well. As you can see, CDN has created a shorter connection distance between users and original servers. For example, due to the edge server in London, this faster connection is Possible.
Implementation of CDN solutions: Use RocketCDN and/or/or or/or or/or or /ars Services such as cloudflare so that everyone can quickly access your content, no matter where they are.
RocketCDN will help your images on the desktop and mobile devices faster. After testing, we can see that due to RocketCDN, we saved some loading time (almost 1 second).
After using Rocketcdn Reduce full load time -Source: gtmetrix
6. Do not ignore the slow connection of mobile devices
Another reason for optimizing images is
Considering Still using 3G mobile users
. You should create smaller images for such users. Because the connection speed is slow, the image may be more difficult to display quickly. To correctly adjust the size of the image, please compress them and be below the first screen. Image implementation delay loading.
Use imagify optimizing mobile images If you have many images on your phone, manually adjust the size and compress each one to each one.The image may be time -consuming. Imagine, in addition, do you want to convert all of them into a webp format to improve performance? This is when Imagify enters the game!First, Imagify allows you to adjust and compress existing images and new images on mobile devices. Batch compression occurs at three different levels: normal, radical and super strong:
According to your use of your use In the mode, you can save a large number of images of the file size. Remember, you will be able to reduce the size of the image without loss of loss!
Then, imagified allows you to convert all of them into a webp format just to select these two boxes. This will make the image files in mobile (and desktop) smaller.
The webp format of imagify
A few weeks ago, I sorted it One can be used to accelerate the best image optimization plug -in list on the WordPress website. Let me share with you the interesting results I got with Imagify:
I use imagify and this 450 kb image running speed review:
These are the key conclusions about how imagified helps to reduce mobile images:
After compression, my image still looks great
We saved 55% of the file size
The original size [ 123] The size after optimizing using imagify
Save (%)
450 kb
203 kb 55%
[
123]
In addition, imagified fixes some problems with PSI labels. Check our image -related questions before and after using the plug -in:
I imagined the previous diagnosis part
I passed the review after imagify
What if you don’t use WordPress?
It doesn’t matter.
IMAGIFY also has a web -based application to adjust the size and compressed images in batches. Just drag and drop your image: Imagify will compress them, which will be available for within the next 24 hours.
When using Web -based Imagify applications, I noticed two things:
My PNG image has been adjusted
and compressed by 85%[ 123] (
Using ultra -compressed mode
)
Another
decreased by 30%
(
Use normal mode
[ 123]
Compressed image -Source: imagify web -based tool
is like using Imagify WordPress Like the plug -in, you can optimize 20 MB of images per month, $ 4.99 per month, 500 MB data, and an unlimited plan of $ 9.99
unlimited
images per month.
Packing up
Optimizing the image for mobile websites is a simple and economical method for improving the conversion rate. Once your image is effectively optimized, make sure they have the correct format and use the delayed loading script to deliver at the right time.
In order to make speed optimization sustainable, the speed of the site must be an important indicator of the entire company and part of its KPI list. Now it is time for enterprises around the world to use IMAGIFY and WP Rocket to quickly establish a website on all devices (including smartphones and tablets).
IMAGIFY’s data for up to 20 MB is free. Take it to test drive and tell us your thoughts in the comments part!
movement speed on your brand website should be a priority. Each marketer needs a \”mobile speed budget\” because mobile devices are the most commonly used platforms: people use mobile phones to search, browse and shopping more times than ever.
How to affect the overall performance score .
The following format provides images, and uses webp 
Note: Just Like GTMETRIX, you need the Pro version to test your website on mobile devices. 
may affect the list of the availability of any mobile device on your website on the mobile device, such as small fonts (difficult to be in the small font (difficult to be on the font Read on mobile devices) or use Flash (most mobile devices do not support).
is not suitable for mobile devices Website
The response tab and visible part of the mobile device -Source: Elementor Website Builder
Optimole -Provide compression, delay loading and advanced cuts
File size:
：
This is when Imagify enters the game!
The size after optimizing using imagify 
The image is relative to the viewport relative to the viewport relative to the viewport The size
If you want to know more information, 
4. Implement delay loading
